<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			#d1 {
				width: 100px;
				height: 100px;
				background-color: #008000;
				float: left;
				color: #fff;
			}

			#d2 {
				width: 200px;
				height: 200px;
				background-color: #800080;
				/* float: left; */
			}
			#d3 {
				width: 300px;
				height: 300px;
				background-color: #057ED4;
				/* float: left; */
			}
			
			#wrap2 {
				width: 550px;
				border: 3px solid red;
				overflow: auto;
			}
			.class1 {
				width: 200px;
				height: 400px;
				background: blue;
				float: left;
			}
			.class2 {
				width: 200px;
				height: 300px;
				background: yellow;
				float: left;
			}
			.class3 {
				width: 200px;
				height: 300px;
				background: fuchsia;
				float: left;
			}
			.class4 {
				width: 200px;
				height: 200px;
				background: chartreuse;
				float: left;
			}
		</style>
	</head>
	<body>
		<div id="d1">
			渲染
		</div>
		<div id="d2"></div>
		<div id="d3"></div>
		<div id="d4"></div>

		<div id="wrap2">
			<div class="class1"></div>
			<div class="class2"></div>
			<div class="class3"></div>
			<div class="class4"></div>
		</div>

	</body>
</html>
